Measurement of Z0 decays to hadrons, and a precise determination of the number of neutrino species

L3 Collaboration, X. Leytens

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Abstract

We have made a precise measurement of the cross section for e+e-→Z0→hadrons with the L3 detector at LEP, covering the s range from 88.28 to 95.04 GeV. From a fit to the Z0 mass, total width, and the hadronic cross section to be MZ 0=91.160 ± 0.024 (experiment) ±0.030(LEP) GeV, ΓZ 0=2.539±0.054 GeV, and σh(MZ 0)=29.5±0.7 nb. We also used the fit to the Z0 peak cross section and the width todetermine Γinvisible=0.548±0.029 GeV, which corresponds to 3.29±0.17 species of light neutrinos. The possibility of four or more neutrino flavors is thus ruled out at the 4σ confidence level.

Original languageEnglish
Pages (from-to)136-146
Number of pages11
JournalPhysics Letters B
Volume237
Issue number1
DOIs
Publication statusPublished - 8 Mar 1990
Externally publishedYes

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